Topic
Sessile drop technique
About: Sessile drop technique is a research topic. Over the lifetime, 2827 publications have been published within this topic receiving 68943 citations.
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TL;DR: In this paper, a computer-aided analysis of the generalized sessile drop form leads to an explicit equation for interfacial tension dependent only on drop height (from apex to solid support) and the magnitude of the drop equatorial diameter.
Abstract: The silhouette of a sessile drop submerged in a transparent bulk phase appears to possess a contact angle of 180° with a plane solid support, when the drop is separated from the solid surface by a thin film of surrounding fluid. A computer-aided analysis of the generalized sessile drop form leads to an explicit equation for interfacial tension dependent only on drop height (from apex to solid support) and the magnitude of the drop equatorial diameter. The equation is valid for a wide range of physically realizable drops. Measurements of drop profile coordinates or the location of the drop equator are not required for the use of the method, leading to improvements in accuracy relative to current practice.
Le contour d'une goutte sessile, immergee dans une phase transparente, semble avoir un angle de contact de 180° avec un support solide plan, lorsqu'un film mince de fluide entourant cette goutte la separe de la surface solide. Une analyse numerique de la forme generalisee de la goutte sessile, fournit une relation explicite pour la tension superficielle, fonction unique de la hauteur de la goutte (distance de l'apex au support solide) et du diametre equatorial de la goutte. L'equation s'applique a une grande gamme de gouttes physiquement realisables. L'emploi de cette methode n'exige pas la determination precise du contour de la goutte ni la localisation de son equateur; cette methode est plus precise que celle couramment utilisee.
76 citations
30 Mar 1991-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the effect of oxygen on the wettability of pure metal-ceramic pairs is discussed both when it acts as a dissolved element and when it causes the formation of an oxide film on the liquid metal.
Abstract: Wetting data for liquid metal-ceramic systems are reviewed, with emphasis on experimental results obtained on oxides by the sessile drop technique. Examples are given in order to illustrate the different wetting behaviours of reactive and non-reactive pure metal-ceramic pairs. The effect of oxygen on the wettability is presented both when it acts as a dissolved element and when it causes the formation of an oxide film on the liquid metal. The influnece of alloying elements is illustrated by numerous results and discussed using a thermodynamic model. Using some examples it is shown that the general behaviours holding for wettability in metal-oxide systems are also valid for the other families of ceramics.
76 citations
TL;DR: The ZrTiO4-based sol-gel films can be considered to improve the biocompatibility of metallic implants and despite the higher corrosion protection by the hybrid coating, the sample coated with the inorganic thin film exhibits a better cell response, suggesting the domination of wettability.
Abstract: In this paper, the biocompatibility of a medical-grade stainless steel coated with sol-gel derived, nanostructured inorganic ZrTiO4 and hybrid ZrTiO4-PMMA thin films is correlated with surface characteristics. The surfaces of the samples are characterized by atomic force microscopy, the sessile drop technique, and electrochemical corrosion experiments. The viability of adult human mesenchymal stem cells on the surfaces after one day of culture is also assessed quantitatively and morphologically. According to the results, both of the coatings improve the hydrophilicity, corrosion resistance, and thereby cytocompatibility of the substrate. Despite the higher corrosion protection by the hybrid coating, the sample coated with the inorganic thin film exhibits a better cell response, suggesting the domination of wettability. In summary, the ZrTiO4-based sol-gel films can be considered to improve the biocompatibility of metallic implants.
76 citations
TL;DR: In this paper, the applicability of the complex formation model (CFM) in the framework of statistical mechanical theory in conjunction with quasi-lattice theory (QLT) to describe the surface and transport properties of Au-Sn liquid alloys was investigated.
76 citations
TL;DR: In this article, the surface stress and the surface energy of an elastomeric wire plunged in a liquid were determined by measuring the deformation of a slender body plunged into a liquid.
Abstract: The capillary forces exerted by liquid drops and bubbles on a soft solid are directly measured using molecular dynamics simulations. The force on the solid by the liquid near the contact line is neither oriented along the liquid vapor interface nor perpendicular to the solid surface, as usually assumed, but points towards the liquid. It is shown that the elastic deformations induced by this force can only be explained if, in contrast to an incompressible liquid, the surface stress is different from the surface energy. Using thermodynamic variations we show that the surface stress and the surface energy can both be determined accurately by measuring the deformation of a slender body plunged in a liquid. The results obtained from molecular dynamics fully confirm those recently obtained experimentally [Marchand et al., Phys. Rev. Lett., (2012), 108, 094301] for an elastomeric wire.
75 citations